Published May 23, 2022
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The .setdefault() method will return the value of a dictionary entry for a specified key. If the specified key does not exist in the dictionary, it will create an entry for it with the specified value.


dictionary.setdefault(key, value)

Where key is the key of the value to return. If key does not exist in dictionary, it will be created. value is an optional parameter specifying the value for key if a new entry is created, it has no effect otherwise. If value is not specified, the value None will be used.

Codebyte Example

The following example creates a dictionary, then uses .setdefault() to return values from it:

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